Nitrogen-doped cellulose-based
porous carbon materials were obtained
by hydrothermal method and KOH chemical activation together with melamine
as a nitrogen-doping precursor. The effects of hydrothermal temperature
on the microstructure and surface morphology of the products were
mainly studied. Also, the carbon dioxide adsorption capacity of the
prepared porous carbon was investigated. It was found that when the
hydrothermal carbonization temperature was 270 °C and the mass
ratio of cellulose and melamine was 1:1, the largest micropore specific
surface area of 1703 m2·g–1 and
micropore volume of 0.65 cm3·g–1 were obtained, with a nitrogen-doping composition of 1.68 atom %.
At the temperature of 25 °C and under the pressure of 0.1, 0.2,
0.3, and 0.4 MPa, the adsorption amount of CO2 was 1.56,
3.79, 5.42, and 7.34 mmol·g–1, respectively.
Also, the adsorption process of CO2 was in good accordance
with the Freundlich isotherm model.